Used by those who have designs on others with skin problems (4)

I believe the answer is:

inks

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'used by those who have designs on others' is the definition.
I can't tell whether this defines the answer.

'skin problems' is the wordplay.
'problems' indicates an anagram (I've seen 'problem' mean this).
'skin' is an anagram of 'INKS'.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for inks that I've seen before include "Fluids from cuttlefish" , "Printers' mediums" , "Printers' media" , "Liquids used for printing" , "Printing fluids" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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